Picking the right panel is critical
for your project and things like location,
building design, local codes and requirements,
and look all factor in.
Today, we are taking a deep dive
into the SMI 1.5" Snaplock 450 SL Panel,
and learning about its application,
installation, and when you should
and shouldn't choose it for your roof.
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I'm Thad Barnette, subscribe
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We release metal roofing and metal construction content
every Monday and Wednesday.
In this series, we look at a specific profile
and discuss when you should and shouldn't use it,
installation requirements, applicable engineering, and more.
Our profile today is SMI 1.5"
Snaplock 450 SL Standing Seam Profile.
It's very similar to the Snaplock 450 panel,
so it shares most of the same qualities.
The only difference is that it has a small bump out
on the male leg which helps stiffen the rib.
It's a standing seam Snaplock system
which means it's installed with hidden clips
and fasteners on the male leg
and the female leg snaps on to engage the panel.
Sheffield recommends a maximum 16" panel width
and a minimum of 24 gauge steel
to ensure the panel has enough strength and rigidity.
This panel used approximately 4.12"
of material to be formed.
Just like other Snaplock panels,
the 1.5" Snaplock 450 SL panel
is a hydrokinetic system,
which means it must shed water
quickly to remain weathertight,
to do that, it must be at a slope
at or greater than a 312.
Unlike the 550 Snaplock and the 1.75" Snaplock panels,
There's no continuous lock on the 450 SL
even with the small bump out on the male leg,
this means the panel's uplift pressure performance
is based solely on clip spacing,
because the panel effectively engages
by locking on the clip itself.
Engineering is important because it uses
actual data gathered about the exact panel profile
and ensures that if you install your roof
per those specifications, you're giving it the best
chance possible to perform.
For the SMI 1.5" Snaplock 450 SL,
there's currently only a UL90 construction number available
which provides a blanket test
that covers several different similar panels.
Do know that this is not the same
as having specific testing performed
in a laboratory for this particular profile
and it doesn't include other tests
like water penetration and air infiltration
to make it complete engineered system.
This panel is also rated for class four
impact resistance through UL 2218
and can be used in a class A fire rated assembly
via UL790 testing.
For projects located in Texas,
the panel holds a TDI approval
when using steel over plywood.
And it does qualify of the standard SMI
40 year PVDF paint warranty and Gavelin warranties.
Sheffield Metals is currently working
on upgrading non-engineered profiles to have engineering,
so stay tuned for updates on that.
This panel is a good choice
for residential projects or light commercial projects
depending on building design,
with slopes at or above a 312.
It's good for DIY projects because it snaps together easily
and if you're looking for a commercial weathertight
warranty, Sheffield Metals will offer one
for this panel based on the building design
and conditions.
Don't use this panel over open framing,
at slopes below a 312,
or if you have strict engineering requirements.
Next, let's look at how this goes down on a roof.
Make sure to follow any installation guidelines
or requirements available.
I've already fabricated these panels
with a 1" bend at the eave and a 1" box at the top,
but if you want to learn how to do it yourself,
there's a couple links in the description down below.
On the deck, the panel hooks onto the eave,
is pinned on the box end with a couple fasteners,
and uses fixed clips on the male leg.
If you're following a UL90 construction number,
make sure you use a clip that is approved by that assembly.
This bead of sealant prevents siphoning of water
at the end of the panel..
The next panel hooks onto the eave
and snaps in place, it gets pinned as well
and the process repeats across the roof.
The tab I left on the female leg is optional
and for aesthetics only, you don't need it
as far as performance goes,
but sometimes it's a nice touch for the look of the roof.
Because the panel's only pinned
at the top and snaps in place,
it can expand and contract as needed at the eave.
The Sheffield Metals installation details
has a great thermal movement chart
that shows how much of a gap you should leave at the eave
based on the panel metal, deck material, and panel length
and details for this profile are available
at sheffielmetals.com and those details are recommended
for both commercial and residential projects.
Also, if you run this panel with your New Tech
roll form machine, the same roller kit can run
the 1.5" Snaplock 450 profile as well.
This is a popular profile in the industry
and it will look the same as projects
that use the 1.5" Snaplock 450 panel,
so you can use those for reference
if you want to see what the Snaplock 450 SL panel
looks like on a roof.
If you want to know more about this panel
or other panels that Sheffield Metals offers,
I'll link their profile page in the description box below.
Comment if you have any questions,
subscribe here to the Metal Briefing Channel
And as always, I'm Thad Barnett,
and I'll catch you next time.
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